Gala; not bad (4)
I believe the answer is:
fair
I believe this clue is a double definition.
'gala' is the first definition.
(I've seen this before)
'not bad' is the second definition.
(I've seen this before)
(Other definitions for fair that I've seen before include "Just; sunny" , "the place for a roundabout" , "Unbiased, being light of skin" , "Pretty; impartial" , "Just; amusement" .)